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make sure the secondary is firmly attached in the shroud. The secondary in my 8 inch f4 came adrift from one of the three double sided adhesive tape pads that held it in place. It looked fine and even felt fine until one pushed hard against the side of the mirror - then it moved slightly. Fixed it by soaking in water to soften the tape and then very gingerly prying the mirror out - reglued with silastic and it hasn't moved since. Recently tried to remove it to replace with a higher reflectance secondary, but couldn't get it out -- ah well.
the other thing to consider is, if that is the standard black plastic GSO secondary holder, it can flex quite a bit under load anyway. When I couldn't get my secondary out of its holder, I made up a new one out of PVC pipe fittings and that is rock solid compared to the original.
just a couple of possibilities. good luck.
regards Ray
Last edited by Shiraz; 17-01-2013 at 07:57 PM.
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